Memory leak is a type of resource leak that occurs when a computer program incorrectly manages memory allocations or just overloading, causing to BSOD.
In some programs, Memory leak can cause to crash ENTIRELY, by removing and dumping physical memory in a program.
In Vanilla TPT 93.3, the type of leak leads to crash TPT entirely, due to overloading. I'd highly recommend to install Snapshot 128+/129+, or Jacob1's mod (https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=11117&PageNum=0#Message=172170) to decrease chance to crash.
In Minecraft, the type of leak leads to crash Minecraft entirely, due to overloading. I'd highly recommend to increase memory limit.
A memory leak (or memory error) may happen when an object is stored in memory but cannot be accessed by the Running Code.
You guys seem to have somehow managed to get your hands on some industrial grade crap generator. You sound like those fishy sites that you can get to display any fun message.